CN211662709U

CN211662709U - Upper pressure type hydraulic machine with adjustable opening for mobile platform

Info

Publication number: CN211662709U
Application number: CN201921900498.1U
Authority: CN
Inventors: 熊义; 刘伟
Original assignee: NANTONG METALFORMING EQUIPMENT CO Ltd
Current assignee: NANTONG METALFORMING EQUIPMENT CO Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-10-13
Anticipated expiration: 2029-11-06

Abstract

The patent of the utility model discloses a pressure formula hydraulic press on adjustable mobile station of opening mainly includes liftable formula entablature, stand, travelling table, slider, first stand nut, bottom end rail, second stand nut, pneumatic cylinder, spacing supporting seat, guide rail, stand fixed bolster, stand rotation-proof plate, passive elevating gear. The lifting type upper cross beam comprises an upper cross beam, a motor, a double-output-shaft speed reducer, a first reversing speed reducer, a second reversing speed reducer, a driving gear, a driven gear, a lifting nut, a cover plate, a fixed seat, a thrust bearing, a gasket and a panel; the passive lifting device comprises a lifting support seat, a lifting tray and a guide sleeve. The utility model has the functions of adjustable opening height and upward pressing of the mobile station, and effectively improves the process flexibility level of the hydraulic press; the stroke of the hydraulic cylinder is minimized, which is beneficial to improving the servo control performance of a hydraulic system; the passive lifting device realizes the passive lifting of the mobile station relative to the sliding block, simplifies the hydraulic press system and has the energy-saving effect.

Description

Upper pressure type hydraulic machine with adjustable opening for mobile platform

Technical Field

The patent of the utility model relates to an upward pressure formula hydraulic press especially relates to an upward pressure formula hydraulic press of area mobile station, especially an upward pressure formula hydraulic press that the opening is adjustable, area mobile station.

Background

The size of the opening of the hydraulic press needs to be matched with the height of a processed workpiece or a die; the movable working table can reduce the labor amount for replacing the mold or feeding and taking the workpiece, and is beneficial to improving the efficiency. In the face of the conditions that the height difference of workpieces or dies is large, the pressing strokes are close, and the production batch is small, the investment of a plurality of hydraulic presses with different openings is not economical; and the adoption of the scheme of maximum opening adaptation requires that the hydraulic cylinder has an ultra-long stroke, so that the processing difficulty is high, the manufacturing cost is high, and the control of the hydraulic machine, particularly the servo control, is also unfavorable. The opening adjustment scheme of the hydraulic press must be compatible with a pressing mode and a structural form of a movable workbench, and is easy to automatically operate and economical.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pressure formula hydraulic press on adjustable mobile station of opening can realize opening automation under the condition that does not reduce suppression efficiency and adjust, can not attenuate hydraulic press servo control performance, and the workstation structure of transferring of the passive jacking of compatible while.

The utility model discloses a technical scheme as follows:

the lifting type vertical column lifting device mainly comprises a lifting type upper cross beam, a vertical column, a movable workbench, a sliding block, a first vertical column nut, a lower cross beam, a second vertical column nut, a hydraulic cylinder, a limiting supporting seat, a guide rail, a vertical column fixing support, a vertical column anti-rotation plate and a passive lifting device; the liftable upper beam is arranged on the upper side of the upright post; the cylinder body of the hydraulic cylinder is fixedly arranged on the lower cross beam through a lock nut, the piston rod of the hydraulic cylinder is arranged on the sliding block through a flange, and the hydraulic cylinder drives the sliding block to move up and down; the lower end of the guide rail supporting seat is fixedly arranged on the lower cross beam, and the upper end of the guide rail supporting seat is fixedly connected with the guide rail; through holes are formed at four corners of the sliding block, guide sleeves are arranged in the through holes and are penetrated by the stand columns, sliding friction pairs are formed between the inner surfaces of the guide sleeves and the outer surfaces of the stand columns, and the guide sleeves play a role in guiding and supporting the sliding block; the movable workbench is arranged on the upper plane of the sliding block and can move up and down along with the sliding block; through holes are formed in four corners of the stand column fixing support and are concentric with the four stand columns respectively, and the upper ends of the stand columns penetrate through the through holes so as to be positioned in parallel; the upright post and the upright post fixing bracket are fixedly connected with the upright post anti-rotation plate through bolts, so that the upright post is prevented from rotating; the lifting type upper beam also comprises an upper beam, a motor, a double-output-shaft speed reducer, a first reversing speed reducer, a second reversing speed reducer, a driving gear, a driven gear, a lifting nut, a cover plate, a fixed seat, a thrust bearing, a gasket and a panel; the double-output-shaft speed reducer, the first reversing speed reducer and the second reversing speed reducer are all fixedly arranged on the upper plane of the upper cross beam; the output shaft of the motor is coaxially connected with the input shaft of the double-output-shaft speed reducer, and the body of the motor is connected with the shell of the double-output-shaft speed reducer through a flange; two output shafts of the double-output-shaft speed reducer are respectively and coaxially connected with an input shaft of a first reversing speed reducer through a coupler; two output shafts of each first reversing speed reducer are coaxially connected with an input shaft of a second reversing speed reducer through a coupler respectively; the driving gear is coaxially connected with an output shaft of the second reversing speed reducer through a key; through holes are formed in four corners of the upper beam and are concentric with the four stand columns respectively; the fixing seats are annular and fixedly arranged on the upper plane of the upper cross beam, and the fixing seats are respectively concentric with the through holes at the four corners of the upper cross beam; a washer, a lifting nut and a thrust bearing are sequentially arranged on the inner side of the fixed seat from bottom to top; the cover plate is annular and is fixedly arranged on the upper surface of the fixed seat through a bolt, and the upper end of the lifting nut penetrates out of a middle hole of the cover plate; the lower surface of the cover plate is in contact with the upper surface of the thrust bearing, the lower surface of the thrust bearing is in contact with the upper surface of the middle step of the lifting nut, a gap is reserved between the lower surface of the middle step of the lifting nut and the upper surface of the washer, and the lower surface of the washer is placed on the upper plane of the upper cross beam; the driven gear is coaxially connected with the upper end of the lifting nut through a key, and the driven gear is meshed with the driving gear; the transmission mechanism of the liftable upper beam realizes synchronous rotation of the four lifting nuts in the same direction; the panel is fixed on the lower plane of the upper cross beam through bolts.

Furthermore, a long section of external thread is processed on the upper side of the upright post, and an internal thread matched with the internal thread is processed on the inner side of the lifting nut; the transmission between the internal thread of the lifting nut and the external thread on the upper side of the upright post converts the rotary motion into linear motion so as to realize the lifting adjustment of the upper cross beam, and the section of matched thread is self-locked in the pressing direction; two sections of external threads are processed on the lower side of the upright post and are respectively matched with the first upright post nut and the second upright post nut; through holes are formed in four corners of the lower cross beam and are concentric with the four stand columns respectively; the four stand columns penetrate through the through holes of the lower cross beam and are fixed with the lower cross beam through first stand column nuts and second stand column nuts; the lifting type upper cross beam, the upright post and the lower cross beam form a closed frame.

Further, the passive lifting device comprises a lifting support seat, a lifting tray and a guide sleeve; the lower end of the limiting support seat is fixedly arranged on the upper surface of the lower cross beam, when the slide block is positioned at a lower stroke dead point, the lower plane of the slide block is contacted with the upper plane of the limiting support seat, and the limiting support seat is used for supporting the slide block so as to limit the minimum distance between the slide block and the lower cross beam and prevent the hydraulic cylinder from being impacted; the lower end of the lifting support seat is arranged on the upper surface of the lower cross beam; the guide sleeve is embedded and installed from the upper surface of the sliding block; the lifting tray is arranged in the guide sleeve, and a sliding friction pair is formed between the outer circle surface of the lifting tray and the inner circle surface of the guide sleeve; when the movable workbench moves into a free position of the body of the hydraulic press, the lifting tray is positioned under the roller of the movable workbench, when the sliding block moves upwards, the lifting tray is pressed into the guide sleeve by the roller under the action of the gravity of the movable workbench, and the movable workbench simultaneously descends until the lower plane of the movable workbench is contacted with the upper plane of the sliding block; when the sliding block descends to a lower stroke dead point, the sliding block is supported by the limiting support seat and kept at a fixed height, the lifting support seat upper plane lifts the lifting tray by a fixed height, meanwhile, the lifting tray lifts the movable workbench by a fixed height, the lifting tray upper plane is flush with the guide rail upper plane, and the movable workbench can move out of the body neutral position of the hydraulic press through the guide rail.

The utility model discloses a beneficial effect does:

1. the opening of the hydraulic press is automatically adjusted, and only one hydraulic press is needed to be adopted in the case of large height difference of workpieces or molds, so that the pressing efficiency is not influenced;

2. the utility model is compatible with the structure of the movable workbench, and realizes the passive jacking of the movable workbench;

3. the utility model discloses well pneumatic cylinder stroke only needs satisfy the suppression stroke of work piece, does not need extra increase length, so can not lead to the decay of hydraulic system servo control performance.

Drawings

Fig. 1 is a side view of the structure of the present invention.

Fig. 2 is a front view of the structure of the present invention.

Figure 3 is the utility model discloses a side view of liftable entablature.

Figure 4 is the utility model discloses a but the plan view of lifting entablature.

Fig. 5 is a schematic structural view of the passive lifting device of the present invention.

In fig. 1: 1-liftable upper beam, 2-upright post, 3-movable workbench, 4-slide block, 5-first upright post nut, 6-lower beam, 7-second upright post nut, 8-hydraulic cylinder, 9-limit supporting seat, 10-guide rail supporting seat, 11-guide rail, 12-upright post fixing bracket, 13-upright post anti-rotation plate and 221-sensor bracket.

In fig. 2: 1-liftable upper beam, 2-upright post, 3-movable workbench, 4-slide block, 5-first upright post nut, 6-lower beam, 7-second upright post nut, 8-hydraulic cylinder, 10-guide rail support seat, 11-guide rail, 12-upright post fixed support, 13-upright post anti-rotation plate and 221-sensor support.

In fig. 3: 101-upper beam, 102-motor, 103-double output shaft reducer, 104-first reversing reducer, 105-second reversing reducer, 106-driving gear, 107-driven gear, 108-lifting nut, 109-cover plate, 110-fixing seat, 111-thrust bearing, 112-gasket, 113-panel and 2-column.

In fig. 4: 101-upper beam, 102-motor, 104-first reversing reducer, 106-driving gear, 107-driven gear, 121-coupler and 122-coupler.

In fig. 5: 1401-lifting support base, 1402-lifting tray, 1403-guide sleeve, 2-upright post, 3-moving workbench, 4-slide block, 5-first upright post nut, 6-lower beam and 9-limiting support base.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 and 2, the utility model mainly comprises a liftable upper beam 1, an upright post 2, a movable workbench 3, a slider 4, a first upright post nut 5, a lower beam 6, a second upright post nut 7, a hydraulic cylinder 8, a limit support seat 9, a guide rail support seat 10, a guide rail 11, an upright post fixing bracket 12, an upright post anti-rotation plate 13 and a passive lifting device 14; the liftable upper beam 1 is arranged on the upper side of the upright post 2; the cylinder body of the hydraulic cylinder 8 is fixedly arranged on the lower cross beam 6 through a lock nut, the piston rod of the hydraulic cylinder 8 is arranged on the sliding block 4 through a flange, and the hydraulic cylinder 8 drives the sliding block 4 to move up and down; the lower end of the guide rail supporting seat 10 is fixedly arranged on the lower cross beam 6, and the upper end of the guide rail supporting seat 10 is fixedly connected with the guide rail 11; through holes are formed in four corners of the sliding block 4, guide sleeves are installed in the through holes and are penetrated by the upright posts 2, sliding friction pairs are formed between the inner surfaces of the guide sleeves and the outer surfaces of the upright posts 2, and the guide sleeves play a role in guiding and supporting the sliding block 4; the movable workbench 3 is arranged on the upper plane of the sliding block 4 and can move up and down along with the sliding block 4; through holes are formed in four corners of the stand column fixing support 12, the through holes are concentric with the four stand columns 2 respectively, and the upper ends of the stand columns 2 penetrate through the through holes so as to be positioned in parallel; the upright 2 and the upright fixing bracket 12 are fixedly connected with the upright anti-rotation plate 13 through bolts, so that the upright 2 is prevented from rotating.

Referring to fig. 3 and 4, the liftable upper beam 1 of the present invention further includes an upper beam 101, a motor 102, a dual-output shaft reducer 103, a first reversing reducer 104, a second reversing reducer 105, a driving gear 106, a driven gear 107, a lifting nut 108, a cover plate 109, a fixing seat 110, a thrust bearing 111, a washer 112, and a panel 113; the double-output-shaft speed reducer 103, the first reversing speed reducer 104 and the second reversing speed reducer 105 are all fixedly arranged on the upper plane of the upper beam 101; an output shaft of the motor 102 is coaxially connected with an input shaft of the double output shaft speed reducer 103, and a body of the motor 102 is connected with a shell of the double output shaft speed reducer 103 through a flange; two output shafts of the double output shaft speed reducer 103 are respectively and coaxially connected with an input shaft of a first reversing speed reducer 104 through a coupler 121; the two output shafts of each first reversing speed reducer 104 are coaxially connected with the input shaft of one second reversing speed reducer 105 through a coupler 122; the driving gear 106 is coaxially coupled with the output shaft of the second reversing reducer 105 through a key; four corners of the upper cross beam 101 are provided with through holes which are respectively concentric with the four upright posts 2; the fixed seat 110 is annular and is fixedly arranged on the upper plane of the upper cross beam 101, and the fixed seat 110 is concentric with the through holes at four corners of the upper cross beam 101 respectively; the inner side of the fixed seat 110 is sequentially provided with a gasket 112, a lifting nut 108 and a thrust bearing 111 from bottom to top; the cover plate 109 is annular and is fixedly arranged on the upper surface of the fixed seat 110 through bolts, and the upper end of the lifting nut 108 penetrates out of a middle hole of the cover plate 109; the lower surface of the cover plate 109 is contacted with the upper surface of a thrust bearing 111, the lower surface of the thrust bearing 111 is contacted with the upper surface of a middle step of the lifting nut 108, a gap is reserved between the lower surface of the middle step of the lifting nut 108 and the upper surface of a gasket 112, and the lower surface of the gasket 112 is placed on the upper plane of the upper cross beam 101; the driven gear 107 is coaxially connected with the upper end of the lifting nut 108 through a key, and the driven gear 107 is meshed with the driving gear 106; the transmission mechanism of the liftable upper beam 101 realizes synchronous rotation of the four lifting nuts 108 in the same direction; the panel 113 is bolted to the lower surface of the upper beam 101.

The utility model is provided with a long section of external thread on the upper side of the upright post 2, and an internal thread matched with the internal thread is arranged on the inner side of the lifting nut 108; the transmission between the internal thread of the lifting nut 108 and the external thread on the upper side of the upright post 2 converts the rotary motion into linear motion so as to realize the lifting adjustment of the upper cross beam 101, and the matching thread is self-locked in the pressing direction; two sections of external threads are processed on the lower side of the upright post 2 and are respectively matched with the first upright post nut 5 and the second upright post nut 7; through holes are formed in four corners of the lower cross beam 6 and are concentric with the four upright posts 2 respectively; the four upright posts 2 penetrate through holes of the lower cross beam 6 and are fixed with the lower cross beam 6 through first upright post nuts 5 and second upright post nuts 7; the lifting type upper beam 1, the upright post 2 and the lower beam 6 form a closed frame.

Referring to fig. 5, the passive lifting device 14 of the present invention includes a lifting support base 1401, a lifting tray 1402 and a guide sleeve 1403; the lower end of the limit supporting seat 9 is fixedly arranged on the upper surface of the lower cross beam 6, when the slide block 9 is positioned at a lower stroke dead point, the lower plane of the slide block 4 is contacted with the upper plane of the limit supporting seat 9, and the limit supporting seat 9 is used for supporting the slide block 4 so as to limit the minimum distance between the slide block 4 and the lower cross beam 6 and prevent the hydraulic cylinder 8 from being impacted; the lower end of the lifting support seat 1401 is arranged on the upper surface of the lower cross beam 6; the guide sleeve 1403 is embedded and installed from the upper surface of the slider 4; the lifting tray 1402 is installed in the guide sleeve 1403, and a sliding friction pair is formed between the outer circle surface of the lifting tray 1402 and the inner circle surface of the guide sleeve 1403; when the movable workbench 3 moves into a neutral position of the hydraulic press body, the lifting tray 1402 is positioned under the roller of the movable workbench 3, when the slide block 4 moves upwards, the lifting tray 1402 is pressed into the guide sleeve 1403 by the roller under the action of the gravity of the movable workbench 3, and the movable workbench 3 descends simultaneously until the lower plane of the movable workbench 3 is contacted with the upper plane of the slide block 4; when the slide block 4 descends to a bottom stroke dead point, the slide block 4 is supported by the limit support base 9 and is kept at a fixed height, the upper plane of the lifting support base 1401 lifts the lifting tray 1402 to a fixed height, meanwhile, the lifting tray 1402 lifts the movable workbench 3 to a fixed height, at the moment, the upper plane of the lifting tray 1402 is flush with the upper plane of the guide rail 11, and the movable workbench 3 can move out of the neutral position of the hydraulic machine body through the guide rail 11.

In practical application, the sensor bracket 221 is provided with a displacement sensor for detecting the height of the liftable upper beam 1, so that the closed loop automatic adjustment of the opening of the hydraulic machine can be realized; the internal thread of the lifting nut 108 and the external thread on the upper side of the upright post 2 are self-locked in the pressing direction, so that the opening is not changed during pressing. The utility model discloses well pneumatic cylinder stroke only needs satisfy the suppression stroke of work piece, does not need extra increase length, so can not lead to the decay of hydraulic system servo control performance. The utility model discloses well mobile workbench 3's lift is accomplished passively along with the up-and-down stroke motion of slider 4, does not need special control system and energy input.

Claims

1. An upper pressure type hydraulic machine with an adjustable opening for a mobile platform is characterized in that: the lifting type vertical column lifting device mainly comprises a lifting type upper cross beam (1), a vertical column (2), a movable workbench (3), a sliding block (4), a first vertical column nut (5), a lower cross beam (6), a second vertical column nut (7), a hydraulic cylinder (8), a limiting support seat (9), a guide rail support seat (10), a guide rail (11), a vertical column fixing support (12), a vertical column anti-rotating plate (13) and a passive lifting device (14); the liftable upper beam (1) is arranged on the upper side of the upright post (2); the cylinder body of the hydraulic cylinder (8) is fixedly arranged on the lower cross beam (6) through a lock nut, the piston rod of the hydraulic cylinder (8) is arranged on the sliding block (4) through a flange, and the hydraulic cylinder (8) drives the sliding block (4) to move up and down; the lower end of the guide rail supporting seat (10) is fixedly arranged on the lower cross beam (6), and the upper end of the guide rail supporting seat (10) is fixedly connected with the guide rail (11); through holes are formed in four corners of the sliding block (4), guide sleeves are installed in the through holes and are penetrated by the upright posts (2), sliding friction pairs are formed between the inner surfaces of the guide sleeves and the outer surfaces of the upright posts (2), and the guide sleeves play a role in guiding and supporting the sliding block (4); the movable workbench (3) is arranged on the upper plane of the sliding block (4) and can move up and down along with the sliding block (4); through holes are formed in four corners of the stand column fixing support (12), the through holes are concentric with the four stand columns (2), and the upper ends of the stand columns (2) penetrate through the through holes so as to be positioned in parallel; the upright post (2) and the upright post fixing bracket (12) are fixedly connected with an upright post anti-rotation plate (13) through bolts, so that the upright post (2) is prevented from rotating; the lifting type upper beam (1) further comprises an upper beam (101), a motor (102), a double-output-shaft speed reducer (103), a first reversing speed reducer (104), a second reversing speed reducer (105), a driving gear (106), a driven gear (107), a lifting nut (108), a cover plate (109), a fixed seat (110), a thrust bearing (111), a gasket (112) and a panel (113); the double-output-shaft speed reducer (103), the first reversing speed reducer (104) and the second reversing speed reducer (105) are all fixedly arranged on the upper plane of the upper beam (101); an output shaft of the motor (102) is coaxially connected with an input shaft of the double-output-shaft speed reducer (103), and a body of the motor (102) is connected with a shell of the double-output-shaft speed reducer (103) through a flange; two output shafts of the double output shaft speed reducer (103) are respectively and coaxially connected with an input shaft of a first reversing speed reducer (104) through a coupler; two output shafts of each first reversing speed reducer (104) are coaxially connected with an input shaft of one second reversing speed reducer (105) through a coupler respectively; the driving gear (106) is coaxially connected with an output shaft of the second reversing speed reducer (105) through a key; through holes are formed in four corners of the upper cross beam (101), and the through holes are concentric with the four upright posts (2) respectively; the fixing seat (110) is annular and is fixedly arranged on the upper plane of the upper cross beam (101), and the fixing seat (110) is concentric with the through holes at four corners of the upper cross beam (101) respectively; a washer (112), a lifting nut (108) and a thrust bearing (111) are sequentially arranged on the inner side of the fixed seat (110) from bottom to top; the cover plate (109) is annular and is fixedly arranged on the upper surface of the fixed seat (110) through a bolt, and the upper end of the lifting nut (108) penetrates out of a middle hole of the cover plate (109); the lower surface of the cover plate (109) is in contact with the upper surface of a thrust bearing (111), the lower surface of the thrust bearing (111) is in contact with the upper surface of a middle step of the lifting nut (108), a gap is reserved between the lower surface of the middle step of the lifting nut (108) and the upper surface of a gasket (112), and the lower surface of the gasket (112) is placed on the upper plane of the upper cross beam (101); the driven gear (107) is coaxially connected with the upper end of the lifting nut (108) through a key, and the driven gear (107) is meshed with the driving gear (106); the transmission mechanism of the liftable upper beam (101) realizes synchronous rotation of four lifting nuts (108) in the same direction; the panel (113) is fixed on the lower plane of the upper cross beam (101) through bolts.

2. The hydraulic press with adjustable opening on the movable table as claimed in claim 1, wherein: a long section of external thread is processed on the upper side of the upright post (2), and an internal thread matched with the internal thread is processed on the inner side of the lifting nut (108); the transmission between the internal thread of the lifting nut (108) and the external thread on the upper side of the upright post (2) converts the rotary motion into linear motion so as to realize the lifting adjustment of the upper cross beam (101), and the section of matching thread is self-locked in the pressing direction; two sections of external threads are processed on the lower side of the upright post (2) and are respectively matched with the first upright post nut (5) and the second upright post nut (7); through holes are formed in four corners of the lower cross beam (6), and the through holes are concentric with the four upright posts (2) respectively; the four upright posts (2) penetrate through holes of the lower cross beam (6) and are fixed with the lower cross beam (6) through first upright post nuts (5) and second upright post nuts (7); the lifting type upper beam (1), the upright post (2) and the lower beam (6) form a closed frame.

3. The hydraulic press with adjustable opening on the movable table as claimed in claim 1, wherein: the passive lifting device (14) comprises a lifting support seat (1401), a lifting tray (1402) and a guide sleeve (1403); the lower end of the limiting support seat (9) is fixedly arranged on the upper surface of the lower cross beam (6), when the sliding block (4) is positioned at a lower stroke dead point, the lower plane of the sliding block (4) is contacted with the upper plane of the limiting support seat (9), and the limiting support seat (9) is used for supporting the sliding block (4) so as to limit the minimum distance between the sliding block (4) and the lower cross beam (6) and prevent the hydraulic cylinder (8) from being impacted; the lower end of the lifting support seat (1401) is arranged on the upper surface of the lower cross beam (6); the guide sleeve (1403) is embedded and installed from the upper surface of the sliding block (4); the lifting tray (1402) is arranged in the guide sleeve (1403), and a sliding friction pair is formed between the outer circle surface of the lifting tray (1402) and the inner circle surface of the guide sleeve (1403); when the movable workbench (3) moves into a neutral position of the hydraulic machine body, the lifting tray (1402) is positioned under the roller of the movable workbench (3), when the sliding block (4) moves upwards, the lifting tray (1402) is pressed into the guide sleeve (1403) by the roller under the action of the gravity of the movable workbench (3), and the movable workbench (3) simultaneously descends until the lower plane of the movable workbench (3) is contacted with the upper plane of the sliding block (4); when the sliding block (4) descends to a bottom stroke dead point, the sliding block (4) is supported by the limiting support seat (9) and is kept at a fixed height, the upper plane of the lifting support seat (1401) lifts the lifting tray (1402) to a fixed height, meanwhile, the lifting tray (1402) lifts the movable workbench (3) to a fixed height, the upper plane of the lifting tray (1402) is flush with the upper plane of the guide rail (11), and the movable workbench (3) can move out of the neutral position of the hydraulic press body through the guide rail (11).